:root {
    --bg-color: #0d0d0d;
    --panel-bg: rgba(30, 30, 30, 0.8);
    --radio-green: #00ff66;
    --radio-green-glow: rgba(0, 255, 102, 0.4);
    --tx-red: #ff3333;
    --tx-red-glow: rgba(255, 51, 51, 0.5);
    --accent-blue: #00ccff;
    --text-main: #ffffff;
    --text-dim: #aaaaaa;
    --glass-border: rgba(255, 255, 255, 0.1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: 'Roboto', sans-serif;
    height: 100vh;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

.app-container {
    width: 100%;
    max-width: 450px;
    height: 100vh;
    background: radial-gradient(circle at center, #1a1a1a 0%, #0d0d0d 100%);
    display: flex;
    flex-direction: column;
    padding: 15px;
    position: relative;
    border-left: 1px solid var(--glass-border);
    border-right: 1px solid var(--glass-border);
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--glass-border);
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 10px;
}

#main-logo {
    height: 40px;
    filter: drop-shadow(0 0 5px var(--accent-blue));
}

h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.2rem;
    letter-spacing: 2px;
    color: var(--accent-blue);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

#settings-toggle {
    background: transparent;
    border: 1px solid var(--glass-border);
    border-radius: 5px;
    padding: 5px 8px;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text-dim);
    transition: all 0.2s;
}

#settings-toggle:hover {
    color: var(--accent-blue);
    border-color: var(--accent-blue);
}

/* Modal Styling */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    transition: opacity 0.3s;
}

.modal-content {
    background: #1a1a1a;
    width: 95%;
    max-width: 420px;
    max-height: 90vh;
    border: 1px solid var(--accent-blue);
    border-radius: 10px;
    padding: 15px;
    box-shadow: 0 0 30px rgba(0, 204, 255, 0.2);
    display: flex;
    flex-direction: column;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 8px;
    flex-shrink: 0;
}

.modal-header h2 {
    font-family: 'Orbitron', sans-serif;
    color: var(--accent-blue);
    font-size: 1rem;
}

#settings-close {
    background: transparent;
    border: none;
    color: var(--text-dim);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
}

#settings-close:hover {
    color: var(--accent-blue);
}

.modal-body {
    overflow-y: auto;
    padding-right: 5px;
}

.modal-body fieldset {
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 20px;
    background: rgba(255, 255, 255, 0.02);
}

.modal-body legend {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.75rem;
    color: var(--accent-blue);
    padding: 0 8px;
    font-weight: bold;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 8px;
}

.input-row {
    display: flex;
    gap: 8px;
}

.input-row .input-group {
    flex: 1;
}

label {
    font-size: 0.7rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

input[type="text"],
input[type="number"],
input[type="password"] {
    background: #000;
    border: 1px solid #333;
    border-radius: 4px;
    padding: 7px;
    color: #fff;
    font-size: 0.85rem;
    transition: border-color 0.2s;
}

input:focus {
    outline: none;
    border-color: var(--accent-blue);
}

.form-actions-inline {
    display: flex;
    justify-content: flex-end;
    margin-top: 10px;
}

.save-btn {
    background: var(--accent-blue);
    border: none;
    padding: 7px 15px;
    border-radius: 4px;
    color: #000;
    font-weight: bold;
    cursor: pointer;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.7rem;
    text-transform: uppercase;
    transition: all 0.2s;
}

.save-btn:active {
    transform: scale(0.95);
    background: var(--radio-green);
}

.shortcut-settings {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.shortcut-settings .input-row input {
    font-size: 0.75rem;
    padding: 5px;
}

.hidden {
    display: none;
    opacity: 0;
    pointer-events: none;
}

/* Status Indicator */
.status-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.7rem;
}

.status-dot {
    width: 8px;
    height: 8px;
    background-color: #555;
    border-radius: 50%;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.5);
}

/* VU Meter */
.vu-section {
    padding: 20px 0;
}

.vu-meter-container {
    background: #000;
    border: 2px solid #333;
    border-radius: 5px;
    height: 50px;
    position: relative;
    overflow: hidden;
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.8);
}

#vu-meter {
    width: 100%;
    height: 100%;
}

.vu-labels {
    display: flex;
    justify-content: space-between;
    padding-top: 5px;
    font-size: 0.6rem;
    color: var(--text-dim);
    font-family: 'Orbitron', sans-serif;
}

/* Controls Grid */
.controls-grid {
    display: grid;
    grid-template-columns: 60px 1fr 60px;
    gap: 20px;
    align-items: center;
    padding: 30px 0;
    flex-grow: 1;
}

.slider-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

input[type="range"] {
    appearance: none;
    -webkit-appearance: slider-vertical;
    width: 8px;
    height: 150px;
    background: #222;
    border-radius: 4px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 25px;
    height: 15px;
    background: var(--text-dim);
    border-radius: 2px;
    cursor: pointer;
    box-shadow: 0 0 5px #000;
}

.slider-val {
    font-size: 0.7rem;
    color: var(--text-dim);
}

/* PTT Button */
.ptt-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.connection-actions {
    display: flex;
    gap: 10px;
    width: 100%;
    justify-content: center;
}

.connect-btn {
    background: transparent;
    border: 1px solid var(--accent-blue);
    color: var(--accent-blue);
    padding: 5px 10px;
    border-radius: 4px;
    font-size: 0.65rem;
    font-family: 'Orbitron', sans-serif;
    text-transform: uppercase;
    cursor: pointer;
    transition: all 0.2s;
    min-width: 100px;
}

.connect-btn.active {
    background: var(--accent-blue);
    color: #000;
    box-shadow: 0 0 10px var(--accent-blue);
}

.connect-btn:hover {
    background: rgba(0, 204, 255, 0.1);
}

.bridge-status-container {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-top: 10px;
}

.bridge-status-container .status-text {
    font-size: 0.6rem;
    color: var(--text-dim);
    text-transform: uppercase;
    font-family: 'Orbitron', sans-serif;
}

#ptt-btn {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    border: none;
    background: #1a1a1a;
    box-shadow:
        0 10px 20px rgba(0, 0, 0, 0.5),
        inset 0 2px 5px rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: all 0.2s ease;
    padding: 10px;
}

.ptt-inner {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    border: 4px solid #333;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: all 0.3s ease;
}

.ptt-label {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.8rem;
    font-weight: bold;
    color: #444;
}

.ptt-status {
    font-size: 0.8rem;
    color: #444;
    margin-top: 5px;
}

/* PTT States */
#ptt-btn:active,
.ptt-active {
    background: #222;
    transform: scale(0.98);
}

#ptt-btn.txing .ptt-inner {
    border-color: var(--tx-red);
    box-shadow: 0 0 30px var(--tx-red-glow);
}

#ptt-btn.txing .ptt-label,
#ptt-btn.txing .ptt-status {
    color: var(--tx-red);
    text-shadow: 0 0 10px var(--tx-red-glow);
}

/* DTMF Section */
.dtmf-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    background: var(--panel-bg);
    padding: 15px;
    border-radius: 10px;
    border: 1px solid var(--glass-border);
}

.dtmf-btn {
    background: #222;
    border: 1px solid #333;
    color: var(--radio-green);
    font-family: 'Orbitron', sans-serif;
    font-size: 1.2rem;
    padding: 12px 0;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.1s;
    text-shadow: 0 0 5px var(--radio-green-glow);
}

.dtmf-btn:active {
    background: var(--radio-green);
    color: #000;
    box-shadow: 0 0 15px var(--radio-green);
}

.dtmf-cmd {
    color: var(--accent-blue);
    text-shadow: 0 0 5px var(--accent-blue);
}

/* Shortcuts */
.tg-shortcuts {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    padding-top: 20px;
}

.tg-btn {
    background: transparent;
    border: 1px solid var(--accent-blue);
    color: var(--accent-blue);
    font-size: 0.7rem;
    padding: 8px 0;
    border-radius: 4px;
    cursor: pointer;
    font-family: 'Orbitron', sans-serif;
}

.tg-btn:hover {
    background: var(--accent-blue);
    color: #000;
}